Mixing valve



FIG. 1 is a front view showing my new design for a mixing valve,including a hand lever;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

The ornamental design for a mixing valve, as shown and described.